While no one knows exactly what goes on inside these parties, the document also warns the get-togethers may include activities that are "potentially hazardous and you should not participate unless you are medically able and properly trained".

The risks involved apparently include "minor injuries to catastrophic injuries, including death".

Justin may be eager to change public perception after hitting headlines for a number of controversial reasons lately.

As well as turning up late for a UK gig and being accused of assaulting a neighbour, the star has now come under fire for "abandoning" his pet monkey.